1 files changed, 13 insertions, 0 deletions

diff --git a/src/test/ui/issues/issue-47646.rs b/src/test/ui/issues/issue-47646.rs
new file mode 100644
index 000000000..ace6cdce8
--- /dev/null
+++ b/src/test/ui/issues/issue-47646.rs
@@ -0,0 +1,13 @@
+use std::collections::BinaryHeap;
+
+fn main() {
+    let mut heap: BinaryHeap<i32> = BinaryHeap::new();
+    let borrow = heap.peek_mut();
+
+    match (borrow, ()) {
+        (Some(_), ()) => {
+            println!("{:?}", heap); //~ ERROR cannot borrow `heap` as immutable
+        }
+        _ => {}
+    };
+}